Synthese von einigen 2H-Pyran-2-on-Derivaten

✍ Scribed by Vratislav Kvita; Hanspeter Sauter

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: German
• Weight: 393 KB
• Volume: 73
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19900730414

✦ Synopsis

The Synthesis of Some 2__H__‐Pyran‐2‐one Derivatives

Derivatives of 6‐unsubstituted 2__H__‐pyran‐2‐one have been synthesized by several different methods. The 4‐chloro‐2__H__‐pyran‐2‐one (9) is the most important, since it serves as starting material for the synthesis of different 4‐substituted 2__H__‐pyran‐2‐ones (Scheme 2). Also described are simple transformations of cumalic‐acid derivatives producing 5‐(2,2‐dichlorovinyl)‐2__H__‐pyran‐2‐one (23), 2‐oxo‐2__H__‐pyran‐2‐carbonitrile (26), and 4,5‐bis(trifluoromethyl)‐2__H__‐pyran‐2‐one (32) (Scheme 3 and 4).